.lt-main {
    position: relative;
    height: 100%;
    /*左侧一级导航*/
    .cate-nav-first {
      float: left;
      width: 90px;
      height: 80%;
    //   background-color: red;
        li {
          width: 90px;
          height: 50px;
          line-height: 50px;
          a {
              float: left;
              width: 100%;
              height: 100%;
              border-right: 1px solid #ccc;
              border-bottom: 1px solid #ccc;
              background-color: #fff;
              text-align: center;
              background-color: #E3E4E5;
              color: #666;
          }
          .current {
              background-color: #fff;
              border: none;
           }
        }
    }
    /*一级导航对应的二级导航*/ 
    .cate-nav-second {
        position: relative;
        height: 100%;
        // background-color: yellow;
        overflow: hidden;
        li {
            float: left;
            width: 33.33%;
            text-align: center;
            img {
                width: 70px;
            }
        }
    }
}